The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 20, 1990
Filed:
Jun. 08, 1989
Applicant:
Inventor:
Colin F Wilford, Chester, GB;
Assignee:
The Electricity Council, London, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C22B / ;
U.S. Cl.
CPC ...
75 1060 ; 420 18 ;
Abstract
A process for making ferritic spheroidal graphite iron uses no pig iron but instead melts medium manganese and low silicon content steel scrap in an electric furnace with about 3% by weight of low sulphur content graphite. When the melt reaches 1400.degree. C. it is deslagged. Sufficient graphite is then added to bring the carbon up to at least 3% again and before or after this event, returns may be added to the melt while the furnace electric power is on to induce stirring of the melt. The melt is superheated next to above 1470.degree. C. and carbon and silicon correction is made. This is followed by inoculating the melt and pouring the castings.